 #程序包的构造文件
from flask import Flask,render_template
from flask_bootstrap import Bootstrap
from flask_mail import Mail 
from flask_moment import Moment 
from flask_sqlalchemy import SQLAlchemy 
from config import config
from flask_login import LoginManager
import pymysql
pymysql.install_as_MySQLdb()

bootstrap=Bootstrap()
mail=Mail()
moment=Moment()
db=SQLAlchemy()
login_manager=LoginManager()
login_manager.session_protection='strong'
login_manager.login_view='auth.login'
app=Flask(__name__)
#工厂函数，接受一个参数，是程序使用的配置名
def create_app(config_name):
	#app=Flask(__name__)
	app.config.from_object(config[config_name])
	config[config_name].init_app(app)

	bootstrap.init_app(app)
	mail.init_app(app)
	moment.init_app(app)
	db.init_app(app)
	login_manager.init_app(app)

	#注册蓝本
	from .main import main as main_blueprint
	app.register_blueprint(main_blueprint)

	from .auth import auth as auth_blueprint
	app.register_blueprint(auth_blueprint,url_prefix='/auth')

	#附加路由和自定义的错误页面
	#工厂函数返回创建的程序实例
	return app
